code: def bbox_cxcywh_to_xyxy(x):
      cxcy, wh = paddle.split(x, 2, axis=-1)
      return paddle.concat([cxcy - 0.5 * wh, cxcy + 0.5 * wh], axis=-1)
  
file_path: PaddleDetection/ppdet/modeling/proposal_generator/embedding_rpn_head.py
imports: import paddle
  from paddle import nn
  from ppdet.core.workspace import register
label_desc: Use image node_id 4 for calling the EmbeddingRPNHead obj's underlying member method code with example usage: obj.bbox_cxcywh_to_xyxy(x) and returns: paddle